NZ222338A - Mobile radio transmitter; remote control of output power level overridden by overtemperature - Google Patents

Mobile radio transmitter; remote control of output power level overridden by overtemperature

Info

Publication number
NZ222338A
NZ222338A NZ222338A NZ22233887A NZ222338A NZ 222338 A NZ222338 A NZ 222338A NZ 222338 A NZ222338 A NZ 222338A NZ 22233887 A NZ22233887 A NZ 22233887A NZ 222338 A NZ222338 A NZ 222338A
Authority
NZ
New Zealand
Prior art keywords
output power
control circuit
signal
level
power level
Prior art date
Application number
NZ222338A
Inventor
Katsuyama Tsutomu
Yoshida Isao
Kanai Toyoo
Taguchi Yasunobu
Original Assignee
Oki Electric Ind Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oki Electric Ind Co Ltd filed Critical Oki Electric Ind Co Ltd
Publication of NZ222338A publication Critical patent/NZ222338A/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/52—TPC using AGC [Automatic Gain Control] circuits or amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/03—Constructional details, e.g. casings, housings
    • H04B1/036—Cooling arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B2001/0408—Circuits with power amplifiers
    • H04B2001/0416—Circuits with power amplifiers having gain or transmission power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Transceivers (AREA)

Abstract

An output power control circuit is provided in a casing of a mobile radio apparatus together with an automatic power control circuit and an RF signal amplifier. The output power control circuit applied level control signals to the automatic power control circuit for maintaining the power level of the output RF signal of the RF amplifier at one of a plurality of output power levels corresponding to the level control signals. The output power control circuit has a receiver, a temperature sensing circuit and a logic circuit. The receiver receives RF signals transmitted by a master station and detects power level setting command signals included in the received RF signal. The temperature sensing circuit detects an internal temperature of the casing and provides a power reduction signal upon detecting that the internal temperature has exceeded a predetermined temperature. The logic circuit receives the power level setting command signal from said receiver, and generates a level control signal for determining an output power level corresponding to the power level setting command signal, and generates a level control signal for determining an output power level which is lower than that specified by the power level setting command signal upon receiving the power reduction signal from the temperature sensing circuit.

Description

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Publication Date: W.Wy..Tr P.O. Joumc.', "r: ... A3S&: Patents form No 5 PATENTS ACT 1953 COMPLETE SPECIFICATION Number Dated OUTPUT POWER CONTROL CIRCUIT FOR A MOBILE RADIO APPARATUS Cyipcc. C$0 3/9/88 l/WE OKI ELECTRIC INDUSTRY COMPANY LIMITED, of 7-12, Toranomon 1-chome, Minato-ku, Tokyo, Japan, a Japanese Company do hereby declare the invention for which tfwe pray that a Patent may be granted to xne/us, and the method by which it is to be performed, to be particularly described in and by the following statement: 222338 RF signal amplifier.
Particularly, when the RF signal amplifier provides RF signals at the maximum power, for example, three watts, the RF signal amplifier generates heat at a high rate, which further reduces the time in which the internal temperature of the casing rises to a predetermined upper limit temperature.
Incidentally, the output power level of the RF amplifier is maintained at a stable output power level by an automatic power control circuit (hereinafter abbreviated as an "APC" circuit).
As described in detail in U.S. Patent Nos. 4,523,155 and 4,602,218, the conventional APC circuit maintains the output power level of the RF signal amplifier at one of a plurality of output power levels which are selected by a plurality of level control signals, namely, parallel input bit patterns, and level control signals to be supplied to the APC circuit are set according to power setting command signals transmitted through a control channel or a voice channel by a master station. Accordingly, the mobile radio apparatus is unable to lower the output power level thereof independently even when the internal temperature of the casing thereof reach the predetermined upper limit temperature. In such a case, the mobile radio apparatus disconnects the power source automatically to interrupt the transmission of RF signals, namely, to prevent communication, until the internal temperature drops below 2 2223 the upper limit temperature.
SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an output power control circuit for a compact mobile radio apparatus, capable of extending the available time of continuous communication by reducing the rising rate of the internal temperature of the casing of the mobile radio ^apparatus.
It is further object of the present invention to apparatus, capable of generating level control signals for controlling the output power level of the RF signal amplifier without spoiling the dependency on power level setting command signals given thereto by a master station.
According to one aspect of the present invention, an output power control circuit for a mobile radio apparatus having a casing, an automatic power control circuit and an RF signal amplifier, provided in the casing of the mobile radio apparatus and adapted to apply level control signals to the automatic power control circuit for maintaining the power level of the output RF signal of the RF amplifier at a power level corresponding to the level control signals, which comprises: a receiver means for receiving RF signals transmitted by a master station and for detecting power level setting command signals included in said received RF signals; a temperature sensing circuit for detecting the internal temperature of the casing and for providing a^power. f provide an output power control circuit for a mobile radio 3 222 reduction signal upon detecting that said internal temperature has exceeded a predetermined temperature; and a logic circuit arranged to receive said power level setting command signals from said receiver means and to generate a level control signal in digital form to said automatic power control circuit for determining an output power level setting command signal from said automatic power control circuit to said RF amplifier, and arranged to receive any said power reduction signal from the temperature sensing circuit and on receipt of a said power reduction signal to generate a level control signal to said automatic power control circuit to cause same to reduce the RF amplifier output power level.
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram of an output power control circuit for a mobile radio 'apparatus, in a preferred embodiment, according to the present invention; Figs. 2(a), 2(b), 2(c) and 2(d) are graphs showing the variation of the internal temperature of the casing of a mobile radio apparatus with time, the variation of voltage applied to the plus input terminal of an amplifier according to the internal temperature with time, the variation of the output voltage of the amplifier according to the voltage applied to the plus input terminal of the same with time, and the variation of the output power level of an RF signal amplifier according to the internal 4 22 2 temperature with time, respectively; Fig. 3 is a flowchart showing steps of a control program to be executed by a logic circuit employed in the output power control circuit of Fig. 1; and Fig. 4 is a block diagram showing in detail a logic circuit according to the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Fig. 1 illustrates a mobile radio apparatus incorporating an output power control circuit, in a preferred embodiment, according to the present invention. The mobile radio apparatus has a conventional transmitter 101, a conventional receiver 103 and a conventional antenna 105. The transmitter 101 feeds RF (radio frequency) signals to a conventional RF signal amplifier 107. The RF signal amplifier 107 amplifies the input RF signals and supplies output RF signals, namely, amplified Rnput RF signals, through a conventional bandpass filter 109 to the antenna 105. The output power level of the RF signal amplifier 107 is proportional to the voltage supplied to the RF signal amplifier 107 by a conventional automatic power control circuit 120 (hereinafter abbreviated as an "APC circuit").
The APC circuit 120 detects the magnitude of the output RF signal of the RF signal amplifier 107 to maintain the output power level of the RF signal amplifier at one of several different output power levels 22 2 3 3 8 corresponding to a plurality of level control signals. In this embodiment, the level control signals are APC command signals represented by 3-bit binary codes produced by a logic circuit 130. The respective actual values of the APC command signals respectively corresponding to eight different output power levels are in the range of about 6.8 dBm to about 34.8 dBm.
When the logic circuit 130 produces an APC command signal of "000", the output power level of the RF signal amplifier 107 rises to the maximum output power level of 34.8 dBm. The output level of the RF signal amplifier varies in an inverse proportion to the APC command signal. That is, when the APC command signal increases by an increment of "1" from "000" to "001", the output power level of the RF signal amplifier 107 decreases by a decrement of 4 dB from 34. 8 dBm to 30.8 dBm. When the APC command signal is "111", the output power level of the RF signal amplifier 107 is 6.8 dBm, which is the minimum output power level of the RF signal amplifier 107.
The logic circuit 130 receives, through the antenna 105 and a conventional bandpass filter 141 and the receiver 103, power setting (hereinafter abbreviated as "PS") command signals transmitted through a control channel or voice channel by a master station (not shown). The PS command signal commands the logic circuit 130 to set the magnitude of the output of the RF signal amplifier 107 at the corresponding output power level. The output 22 2 terminal of a temperature sensing circuit 150 provided in the casing of the mobile radio apparatus is connected to the input terminal of the logic circuit 130 so as to apply an output voltage Vout to the logic circuit 130.
The temperature sensing circuit 150 comprises an operational amplifier 151, a resistor 152 having a value of 4.7 k fi/ a thermistor 153 having a value of 1.9 kflat 75°C, a resistor 154 having a value of 4.53 kfi, a resistor 155 having a value of 160 n and a resistor 156 having a value of 1.6 kn .
The plus input terminal of the operational amplifier 151 is connected through the resistor 152 to a voltage source of +5V and is grounded through the thermistor 153. The minus input terminal of the operational amplifier 151 is connected through the resistor 154 to the voltage source and is grounded through the resistors 155 and 156.
As shown in Pigs. 2(a) and 2(b), A fixed voltage VR of approximately 1.4V is applied to the minus input terminal of the operational amplifier 151 regardless of the variation of the internal temperature of the casing. A voltage VT is applied to the plus input terminal of the operational amplifier 151. The voltage VT is higher than the voltage VR when the internal temperature is the room temperature, and is lower than the voltage VR when the internal temperature is in a temperature range above approximately 72.5°C. As shown in Fig. 2(c), the output voltage Vout of the operational amplifier 151 applied to the logic circuit 130 is 5V when the voltage VT is higher than the voltage VR, and is 0V when the voltage VT is equal to or lower than the voltage VR.
The manner of operation of the logic circuit 130 will be described hereinafter with reference to Fig. 3.
Upon the connection of the mobile radio apparatus to the power source (not shown), the logic circuit 130 generates an APC command signal of "000" in Step 300. Then, the logic circuit 130 receives a PS command signal in Step 310. Upon the reception of the PS command signal, the logic circuit 130 generates an APC command signal for selecting an output power level corresponding to the PS command signal for five seconds in Step 320 After the passage of five seconds from the reception of the PS command signal, in Step 330, when the output voltage Vout is 5v it means that the internal temperature is below the upper limit temperature and the logical circuit 130 generates an APC command signal for selecting an output power level corresponding to the PS command signal in Step 340, and then executes Step 360.
When the determination in Step 330 is "No", namely, when the output voltage Vout of the temperature sensing circuit 150 is not 5V and hence is 0V, the logic circuit 130 generates an APC command signal for selecting an output power level nearest to an output power level lower than the output power level corresponding to the PS 8 ~..i: ■ »iii>?v>. , !* "."f . "V.^V . -„.V- - ... , J ...
■Jk ...... v. - . - O' 22 2 3 3 8 command signal by 4 dB in Step 350, and then executes Step 360. In Step 360, the logic circuit 130 determines if a new PS command signal is received. If a new PS command signal is fed to the logic circuit 130, then the logic circuit 130 executes Step 310 and, if not, the logic circuit 130 executes Step 330.
As shown in Fig. 4, the logic circuit 130 comprises a .(7) microprocessor 410 such as an OKI type IC No. 80C85 and a read-only memory 420 such as a FUJITSU type erasable programmable read-only memory No. MBC 27C256. The microprocessor 410 receives a PS command signal from the receiver 103 and an output voltage Vout from the temperature sensing circuit 150 and applies an APC command signal generated under the control of the read-only memory 420 to the APC circuit 120.
Thus, the logic circuit 130 controls the output power level of the RF signal amplifier 107 so as to be at 34.8 dBm when the internal temperature is lower than approximately 72.5°C, and so as to be at 30.4 dBm when the internal temperature is approximately 72.5°C or higher as shown in Fig. 2(d), notwithstanding the PS command signal requesting an outpet power level of 34.8 dBm. since the internal temperature of a casing having a volume of approximately 800 cm^ rises to approximately 72.5°C or higher when the ambient temperature is in the range of -30°C to +60°C and the output power level of the RF signal amplifier 107 is 34.8 dBm, the logic circuit 130 ;,'Iv iM | >•: s ry. (?) o generates an APC command signal of "001" when the output voltage Vout of the temperature sensing circuit 150 is 0V.

Claims (6)

2223 WHAT WE CIATM IS:
1. An output power control circuit for a mobile radio apparatus having a casing, an automatic power control circuit and an RF signal amplifier, provided in the casing of the mobile radio apparatus and adapted to apply level control signals to the automatic power control circuit for maintaining the power level of the output RF signal of the RF amplifier at a power level corresponding to the level control signals, which comprises: a receiver means for receiving RF signals transmitted by a master station and for detecting power level setting command signals included in said received RF signals; a temperature sensing circuit for detecting the internal temperature of the casing and for providing a power reduction signal upon detecting that said internal temperature has exceeded a predetermined temperature; and a logic circuit arranged to receive said power level setting command signals from said receiver means and to generate a level control signal in digital form to said automatic power control circuit for determining an output power level setting command signal from said automatic power control circuit to said RF amplifier, and arranged to receive any said power reduction signal from the temperature 11 l*t ;o m A ■ON _s» 5 •8 r 3 ^ a 222338 sensing circuit and on receipt of a said power reduction signal to generate a level control signal to said automatic power control circuit to cause same to reduce the RF amplifier output power level.
2. An output power control circuit according to claim 1, wherein the automatic power control circuit is arranged to reduce the RF amplifier output power level for a finite period of time following receipt of a said power reduction signal.
3. An output power control circuit according to claim 1, wherein the temperature sensing circuit is arranged to continuously generate a power reduction signal when the internal temperature of the casing exceeds said predetermined temperature.
4. An output power control circuit according to claim 1, wherein the logic circuit is arranged to continuously generate said level control signals to the automatic power control circuit.
5. An output power control circuit according to any one of claims 1 to 4, wherein the output power level of the RF amplifier is selectable from a plurality of output power levels. 01:1 ■ J) $ ■% •H o r7\ 222358
6. An output power control circuit according to claim 5, wherein the RF amplifier output power level at which the RF amplifier is caused to operate on receipt by the logic circuit of a said power reduction signal is that of said plurality of output power levels nearest to an optimum output power level. WEST-WALKER, McCABE per ATTORNEYS FOR THE APPLICANT! o o 13
NZ222338A 1986-10-29 1987-10-28 Mobile radio transmitter; remote control of output power level overridden by overtemperature NZ222338A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP25593286 1986-10-29
JP62268137A JPS63226124A (en) 1986-10-29 1987-10-26 Level control circuit for radio equipment

Publications (1)

Publication Number Publication Date
NZ222338A true NZ222338A (en) 1990-11-27

Family

ID=26542480

Family Applications (1)

Application Number Title Priority Date Filing Date
NZ222338A NZ222338A (en) 1986-10-29 1987-10-28 Mobile radio transmitter; remote control of output power level overridden by overtemperature

Country Status (6)

Country Link
US (1) US4870698A (en)
JP (1) JPS63226124A (en)
AU (1) AU600764B2 (en)
CA (1) CA1266885A (en)
GB (1) GB2199467B (en)
NZ (1) NZ222338A (en)

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AU600764B2 (en) 1990-08-23
CA1266885A (en) 1990-03-20
JPH0574250B2 (en) 1993-10-18
JPS63226124A (en) 1988-09-20
GB2199467A (en) 1988-07-06
AU8046887A (en) 1988-05-05
US4870698A (en) 1989-09-26
GB2199467B (en) 1990-10-03
GB8725235D0 (en) 1987-12-02

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